C++中执行windows指令

BOOL ExecDosCmd(char cmd[1024]) 
{
    SECURITY_ATTRIBUTES sa; 
    HANDLE hRead,hWrite;
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    if (!CreatePipe(&hRead,&hWrite,&sa,0))
    {
        return FALSE;
    }
    char command[1024];//长达1K的命令行，够用了吧 
    strcpy(command,"Cmd.exe /C ");
    strcat(command,cmd);
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    si.cb = sizeof(STARTUPINFO);
    GetStartupInfo(&si);
    si.hStdError = hWrite;//把创建进程的标准错误输出重定向到管道输入
    si.hStdOutput = hWrite;//把创建进程的标准输出重定向到管道输入
    si.wShowWindow = SW_HIDE;
    si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    //关键步骤，CreateProcess函数参数意义请查阅MSDN 
    if (!CreateProcess(NULL, command,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi))
    { 
        CloseHandle(hWrite);
        CloseHandle(hRead); 
        return FALSE;
    }
    CloseHandle(hWrite);
    char buffer[4096] = {0};//用4K的空间来存储输出的内容，只要不是显示文件内容，一般情况下是够用了。
    DWORD bytesRead;
    while (true)
    { 
        if (ReadFile(hRead,buffer,4095,&bytesRead,NULL) == NULL)
            break;
        //buffer中就是执行的结果，可以保存到文本，也可以直接输出 
    //    MessageBox(NULL, buffer, TEXT("结果"), MB_OK);
    }
    CloseHandle(hRead);
    return TRUE;
}